28 Owner’s Manual for Mobile Light Tower
Troubleshooting
Troubleshooting the Lights
IMPORTANT NOTE: Only a qualified electrician should troubleshoot or repair electrical problems occurring in this
equipment. Contact Generac Mobile Technical Service at 1-800-926-9768 for assistance if you have any questions, or
if problems persist.
(000278)
WARNING
Burn hazard. Lamps become extremely hot
while in use. Allow 10–15 minutes for cooling
before handling or lowering mast. Touching a
hot lens or fixture can cause severe burns.
(000187)
WARNING
Electrocution. Potentially lethal voltages are generated
by this equipment. Render the equipment safe before
attempting repairs or maintenance. Failure to do so
could result in death or serious injury.
Mast Lights Troubleshooting Guide
Problem Possible Cause Solution
Mast lights OFF but
ballast indicators ON
Light fixture is too hot Allow light to cool 10–15 minutes before restarting.
Faulty lamp connection Check that the lamp is tight in the socket.
Lamp broken Check for broken arc tube or outer lamp jacket, broken or loose components in
lamp envelope, or blackening/deposits inside tube.
Loose lighting
connections
Check the connections inside the mast junction box and each mast light
housing/socket.
Damaged or loose
electrical cord
Check the mast electrical cord for damage and check the cord connections
inside the control box.
Mast lights OFF and
ballast indications
OFF
Loose lighting
connections
Check the connections inside the control box and inside each ballast box.
Generator output incorrect Check the incoming voltage to the ballast by checking the available voltage on
the GFCI receptacle. Incoming voltage should be 120V ±5V. If voltage is
incorrect, the engine speed may need to be adjusted or generator may require
service.
Low transformer output The voltage from the transformer should read approximately 400VAC as the
light “strikes” (induces an arc), then drop and slowly rise back up to stabilize at
240–260VAC. On hard wired models, remove the mast junction box cover and
insert the wire probes into the connector blocks for the light and ground. If
proper voltage is not achieved, perform capacitor check to determine if the
capacitor or coil needs to be replaced.
Mast lights ON but
power output is low
Fixture and/or lens is dirty. Clean reflective surface inside fixture and both inside and outside surface of
glass lens. Use mild soap and water to clean lens. Other chemicals may have
an adverse effect on the glass.
Lamp worn due to normal
use
Replace lamp.
Damaged or loose
electrical connections
Check the mast coil cord, mast junction box and mast light connections.
Generator output incorrect Check the incoming voltage to the ballast. Incoming voltage should be 120V
±5V. If the voltage is incorrect, the engine speed may need to be adjusted or the
generator may require service.
Low transformer output
The voltage from the transformer should read approximately 400VAC as the light
“strikes” (induces an arc), then drop and slowly rise back up to stabilize at 240–
260VAC. On hard wired models, remove the mast junction box cover and insert
the wire probes into the connector blocks for the light and ground. If proper voltage
is not achieved, perform capacitor check to determine if the capacitor or coil needs
to be replaced.
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